Django не отправляет электронные письма

ребята!

У меня возникла проблема с моим проектом Django.

О проекте:

Django version: 3.0.7
Django hosting provider: Digitalocean
E-mail hosting provider: Beget.com
OS: Ubuntu 18.04.6

Здесь находится мой settings.py

EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
EMAIL_USE_TLS = True
EMAIL_HOST = 'smtp.beget.com'
EMAIL_PORT = 465
EMAIL_HOST_USER = 'my@email.com'
EMAIL_HOST_PASSWORD = 'MyVerySecretPassword'
DEFAULT_FROM_EMAIL='my@email.com'

Здесь находится мой views.py

from django.core.mail import send_mail

def register(request):
if request.method == 'POST':
    form = UserRegistrationForm(request.POST)
    if form.is_valid():
        user = form.save(commit=False)
        user.is_active = False
        user.save()
        current_site = get_current_site(request)
        mail_subject = 'Please, activate your account by clicking the link below.'
        message = render_to_string('acc_active_email.html', {
            'user': user,
            'domain': current_site.domain,
            'uid':urlsafe_base64_encode(force_bytes(user.pk)),
            'token':account_activation_token.make_token(user),
        })
        to_email = form.cleaned_data.get('email')

        send_mail(mail_subject, message, settings.DEFAULT_FROM_EMAIL, [to_email])

Что я пытался сделать для решения своей проблемы:

1. Using gmail account (yes, with anabled 'Allow less secure apps')
2. Sending via Django shell (nope, it returns code '1', the mailbox is as empty as my ideas: ( )
3. I have opened 587 and 465 ports in ufw
4. I tried to write and run simple python smtp script to send e-mail via Django shell (spoiler: it worked perfectly on my server via shell), but when I tried to implement this code into my Django code, it failed just like Django send_mail() function:

вот код:

import smtplib

def send_email(user, pwd, recipient, subject, body):


    FROM = user
    TO = recipient if isinstance(recipient, list) else [recipient]
    SUBJECT = subject
    TEXT = body
    message = """From: %s\nTo: %s\nSubject: %s\n\n%s""" % (FROM, ", ".join(TO), SUBJECT, TEXT)
    print(message)
    try:
        server_ssl = smtplib.SMTP_SSL("smtp.beget.com", 465)
        server_ssl.ehlo()
        server_ssl.login(user, pwd)
        server_ssl.sendmail(FROM, TO, message)
        server_ssl.close()
        print('successfully sent the mail')

    except:
        print("failed to send mail")

usn='sender@email.com'
pwd='MyVerySecretPassword'
rc=['reciever@email.com']
subj='HoHoHo'
body='Hello, world'

send_email(usn,pwd,rc,subj,body)

5. I checked all the variables (rendered them on the screen) which I tried to send via e-mail, all of them are correct.
6. Sorry, I am not interested in third party projects like Sendgrid. I just want to understand what I am doing wrong.

Надеюсь, что кто-нибудь сможет помочь мне найти ошибку. Большое спасибо!

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